<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
</head>
<body>
	<select>
		<!-- select 关联的是选中的option的value值 
			   是可读 可写的
				 读 document.querySelector('select').value
			   写 document.querySelector('select').value = '1'
		-->
		<option value="1">我命油我不油天</option>
		<option value="2">北京</option>
		<option value="3">上海</option>
		<option value="4">杭州</option>
	</select>
	
</body>
</html>